implementing security measures both seen and unseen at airports, transit hubs, within the maritime environment. the coast guard is providing security on the ferries in the boston area. viper teams are doing surges in terms of ground transportation and the like. >> the head of the house homeland security committee saying the fbi has a serial number from the pressure cooker that is one of the explosive devices and there are trace chemicals in the powder he says can be traced by investigators to a manufacturer. the same applies to the ball bearings. on the hill a short time ago the attorney general sag no resource is being spared in the investigation. >> i want to assure you, the citizens of boston and all americans, we're working tirelessly to determine who was responsible for this incident. to the -- i have directed the full resources of the department be deployed to make sure this matter was thundershowerly investigated to prevent any future attacks occurring. >> we are hearing about this press conference, katherine, from the fbi. it will be, if it happens, the first in 48 hours two full days.